voiceless th
Rule Core
The voiceless th represents the phoneme /θ/. It is produced without vocal cord vibration and relies on continuous airflow. This sound is stable in spelling–sound correspondence and is a key target in phonics instruction.
Articulation Guide
Place the tongue tip lightly between or against the upper and lower teeth. Keep the mouth relaxed, vocal cords silent, and push air forward to create friction.
Word Analysis
- authenticity: medial th keeps steady airflow.
- bath: final th is /θ/ in standard American English.
- birth: final th must not shift to /s/ or /f/.
Pitfalls
Learners often substitute /θ/ with /s/, /f/, or /t/ due to missing tongue placement.
Phonics Breakdown
Tongue between teeth, no voicing, steady airflow
Sound Reference
- Touch your throat to ensure no vibration
- Exaggerate tongue placement during practice
Common Mistakes
Replacing /θ/ with /s/ or /f/
Adding voicing unintentionally
Example Words
All Words (46)
authenticity bath birth booth breadth breath catholic cloth eleventh esthetics faith forth hypothesis length maths method month moth mouth nothing oath pathetic sixth south thanksgiving theory thesis thick thief thigh thing third thirst thorn thorny thought threshold thrust thunderous tooth twelfth wealth wealthy width worth wreath